| 摘要 |
An apparatus for axial transverse tomography using piercing radiation such as X-ray and gamma -ray for displaying a tomographic image concerning variation of radiation absorption values at a given section of a subject under examination, comprising: a scanner effecting a revolution-scanning around said subject at uniform angles while maintaining constant relative positions of a radiation source and a radiation detector with said subject intervening therebetween; an input device for setting a region of interest for being enlarged based on parameters of central angle, inter-center distance and radius ratio, to locally enlarge said tomographic image; co-ordinate system transforming circuitry for carrying out, on information within said region of interest outputted from radiation detector, a transformation of co-ordinate system corresponding to enlarged co-ordinates, from information obtained by the scanner and outputted by the radiation detector and also from the set parameters; and convolution circuitry for carrying out a convolution operation on the resulting information representing the trnsformation of co-ordinate system. |
